Plant growth and development MCQs with Answers

Question-1. Which one is a long day plant?

1. Spinach
2. Mirabilis jalapa
3. Tobacco
4. Glycine max

Question-2. The hormone which controls cell division and cell differentiation is

1. cytokinin
2. auxin
3. ABA
4. gibberellin

Question-3. A chemical believed to be involved in flowering is

1. florigen
2. gibberellin
3. kinetin
4. IBA

Question-4. A plant completing its life cycle before the onset of dry condition is said to be

1. drought escaping
2. short day plant
3. long day plant
4. All of these

Question-5. A plant hormone used for inducing morphogenesis in plant tissue culture is

1. gibberellins
2. cytokinins
3. ethylene
4. abscisic acid

Question-6. Abscisic acid causes

1. stomatal closure
2. stem elongation
3. leaf expansion
4. root elongation

Question-7. Abscisic acid controls

1. cell division
2. leaf fall and dormancy
3. shoot elongation
4. Cell elongation and wall formation

Question-8. Anthesis is a phenomenon which refers to

1. reception of pollen by stigma
2. formation of pollen
3. development of anther
4. opening of flower bud

Question-9. Apical dominance in plants is caused by

1. high concentration of auxins in the terminal bud
2. high concentration of gibberellins in the apical bud
3. high concentration of auxins in the lateral bud
4. absence of auxins and gibberellins in apical bud

Question-10. Bananas can be prevented from over-ripening by

1. maintaining them at room temperature
2. refrigeration
3. dipping in ascorbic acid solution
4. storing in a freezer

Question-11. Coiling of garden pea tendrils around any support is an example of

1. Thigmotaxis
2. Thigmonasty
3. Thigmotropism
4. Thermotaxis

Question-12. Cytokinins

1. promote abscission
2. influence water movement
3. help retain chlorophyll
4. inhibit protoplasmic streaming

Question-13. Differentiation of shoot is controlled by

1. high cytokinin : auxin ratio
2. high gibberellin : auxin ratio
3. high auxin : cytokinin ratio
4. None of these

Question-14. Dwarfness can be controlled by treating the plant with

1. cytokinin
2. gibberellic acid
3. auxin
4. antigibberellin

Question-15. Ethylene gas is used for

1. growth of plants
2. delaying fruit’s abscission
3. ripening of fruits
4. stopping the leaf abscission

Question-16. Flowering dependent on cold treatment is

1. cryotherapy
2. cryogenics
3. cryoscopy
4. vernalization

Question-17. Geocarpic fruits are produced by

1. onion
2. watermelon
3. ground nut
4. carrot

Question-18. Gibberellins induce

1. flowering
2. production of hydrolyzing enzymes in germinating seeds
3. cell division
4. hasten leaf senescence

Question-19. Highest auxin concentration occurs

1. in growing tips
2. in leaves
3. at base of plant organs
4. in xylem and phloem

Question-20. Hormone primarily connected with cell division is

1. IAA
2. NAA
3. cytokinin/zeatin
4. gibberellic acid

Question-21. If a tree, flowers thrice in a year (Oct., Jan.and July) in Northern India, it is said to be

1. photosensitive but thermoinsensitive
2. thermosensitive but photoinsensitive
3. photo and thermosensitive
4. photo and thermoinsensitive

Question-22. In a plant growing under dark condition, the leaves turn light coloured, internodes become much elongated and it is termed as

1. etiolation
2. chlorosis
3. vernalization
4. phyllotaxy

Question-23. In short day plants, flowering is induced by

1. photoperiod below a critical length and uninterrupted long night.
2. long night
3. short photoperiod and interrupted long night.
4. photoperiod less than 12 hours.

Question-24. Klinostat is employed in the study of

1. osmosis
2. growth movements
3. photosynthesis
4. respiration

Question-25. Leaf fall can be prevented with the help of

1. abscisic acid
2. auxins
3. florigen
4. cytokinins

Question-26. Leaves of many grasses are capable of folding and unfolding because they

1. are very thin
2. are isobilateral
3. have specialized bulliform cells
4. have parallel vascular bundles

Question-27. Movement of auxin is

1. centripetal
2. basipetal
3. acropetal
4. both b) and c)

Question-28. Mowing grass lawn facilitates better maintenance because

1. wounding stimulates regeneration
2. removal of apical dominance and stimulation of intercalary meristem
3. removal of apical dominance
4. removal of apical dominance and promotion of lateral meristem

Question-29. Opening of floral buds into flowers, is a type of

1. autonomic movement of locomotion
2. autonomic movement of variation
3. paratonic movement of growth
4. autonomic movement of growth

Question-30. Parthenocarpic fruit can be produced by the application of which of the following auxin?

1. All of the above
2. 2, 4-D (2-4 dichlorophenoxy acetic aci
3. IAA (Indole acetic acid)d) IBA (Indole butyric acid)

Question-31. Phototropic and geotropic movements are linked to

1. gibberellins
2. enzymes
3. auxins
4. cytokinins

Question-32. Phototropic curvature is the result of uneven distribution of :

1. Gibberellin
2. Phytochrome
3. Cytokinins
4. Auxin

Question-33. Phytohormones are

1. regulators synthesized by plants and influencing physiological processes.
2. hormones regulating growth from seed to adulthood.
3. chemicals regulating secondary growth.
4. chemicals regulating flowering.

Question-34. Primary precursor of IAA is

1. tryptophan
2. phenylalanine
3. tyrosine
4. leucine

Question-35. Removal of apical bud results in

1. formation of new apical bud
2. elongation of main stem
3. death of plant
4. formation of lateral branching

Question-36. Tendrils exhibit/twining of tendrils is due to

1. thigmotropism
2. seismonasty
3. heliotropism
4. diageotropism

Question-37. The closing and opening of the leaves of Mimosa pudica is due to

1. thermonastic movement
2. hydrotropic movement
3. seismonastic movement
4. chemonastic movement

Question-38. The conditions necessary for vernalization are

1. water and carbon dioxide
2. oxygen and water.
3. low temperature and oxygen
4. high temperature and water

Question-39. The hormone responsible for apical dominance is

1. IAA
2. GA
3. ABA
4. florigen

Question-40. The method that renders the seed coat permeable to water so that embryo expansion is not physically retarded, is

1. vernalization
2. stratification
3. denudation
4. scarification

Question-41. The pigment, that absorbs red and far-red light in plants, is

1. xanthophyll
2. cytochrome
3. phytochrome
4. carotene

Question-42. The response of different organisms to environmental rhythms of light and darkness is called

1. phototaxis
2. photoperiodism
3. phototropism
4. vernalization

Question-43. To avoid excessive water loss during severe drought stress,the closure of stomata is signalled by the production of

1. ABA
2. IAA
3. NAA
4. IBA

Question-44. What is agent orange?

1. A biodegradable insecticide
2. A weedicide containing dioxin
3. Colour used in fluorescent lamp
4. A hazardous chemical used in luminous paints

Question-45. What reason will you assign for coconut milk used in tissue culture?

1. Gibberellins
2. Cytokinins
3. Auxins
4. Ethylene

Question-46. What will be the effect on phytochrome in a plant subjected to continuous red light?

1. Level of phytochrome decreases
2. Phytochrome is destroyed
3. Phytochrome synthesis increases
4. Destruction and synthesis of phytochrome remain in equilibrium

Question-47. Which combination of gases is suitable for fruit ripening?

1. 80% CO2 and 20%CH2
2. 80% CH4 and 20%CO2
3. 80% CO2 and 20% O2
4. 80% C2H4 and 20% CO2

Question-48. Which is a stress hormone? or the hormone produced during adverse environmental conditions is

1. benzyl aminopurine
2. dichlorophenoxy acetic acid
3. ethylene
4. abscisic acid

Question-49. Which is employed for artificial ripening of banana fruits?

1. Auxin
2. Cumarin
3. Ethylene
4. Cytokinin

Question-50. Which of the following hormones can replace vernalization?

1. Auxin
2. Cytokinin
3. Gibberellins
4. Ethylene

Question-51. Which of the following hormones does not naturally occur in plants?

1. 2,4–D (2, 4–dichloropheoxy acetic aci
2. IAA
3. ABAd) GA

Question-52. Which of the following movement is not related to auxin level?

1. Bending of shoot towards light
2. Movement of root towards soil
3. Nyctinastic leaf movements
4. Movement of sunflower head tracking the sun

Question-53. Which of the following types of phytohormones resemble the nucleic acids in some structural aspects ?

1. Cytokinin
2. ABA
3. Auxin
4. Gibberellin

Question-54. Which one among the following chemicals is used for causing defoliation of forest trees?

1. 2, 4-dichlorophenoxy acetic acid
2. Malic hydrazide
3. Phosphon-D
4. None of these

Question-55. Which one increases in the absence of light?

1. Uptake of minerals
2. Uptake of water
3. Elongation of internodes
4. Ascent of sap

Question-56. Which one of the following generally acts as an antagonist to gibberellins?

1. ABA
2. Zeatin
3. Ethylene
4. IAA

Question-57. Which one of the following is a long day plant?

1. Wheat
2. Soyabean
3. Bajra
4. Tobacco

Question-58. Which one of the following is a natural growth inhibitor?

1. ABA
2. GA
3. NAA
4. IAA

Question-59. Which one of the following statement regarding auxin is/ are correct?

1. IAA and IBA are natural but NAA, 2, 4-D and 2, 4, 5-T are synthetic auxins
2. IAA and NAA are natural but IBA, 2, 4, 5-T and 2, 4-D are synthetic auxins
3. NAA and 2, 4, 5-T are natural but IAA, IBA and 2, 4-D are synthetic auxins
4. IAA, NAA, IBA, 2, 4-D and 2, 4, 5-T are synthetic auxins.

Question-60. Cavity formed between somatic and splanchnic mesoderm is called

1. Gastrocoele
2. Blastocoele
3. Coelom
4. Neurocoele

Question-61. Cells of fibers and tracheids elongate during

1. Phase of cell division
2. Phase of cell elongation
3. Phase of cell maturation
4. Phase of cell differentiation

Question-62. Growth in dorsiventral leaf is measured in terms of

1. length of leaf
2. increase in cell number
3. surface area increase
4. none of these

Question-63. Intercalary meristems are of

1. Permanent nature
2. Temporary nature
3. Some are permanent some temporary
4. None of these

Question-64. Liver and pancreas arise from

1. Foregut
2. Midgut
3. Hindgut
4. None of these

Question-65. Mechanism of development was explained by

1. Hans Dietrisch
2. Spemann
3. Both a and b
4. Haemmerling

Question-66. Mobilisation of stored food in germinating seeds is triggered by

1. auxins
2. cytokinins
3. gibberellins
4. ethylene

Question-67. Opening of floral buds into flowers, is a type of:

1. Autonomic movement of variation
2. Autonomic movement of locomotion
3. Autonomic movement of growth
4. Paratonic movement of growth

Question-68. Plants grow throughout their life due to

1. presence of meristems
2. presence of vascular cambium
3. presence of xylem and phloem
4. presence of tracheids

Question-69. The ability to regain or recover the lost or injured part of body is

1. Aging
2. Regeneration
3. Abnormal development
4. Primary inductio

Question-70. The stage of rapid cell division just after fertilization is

1. Organogenesis
2. Cleavage
3. Gastrulation
4. Growth

Question-71. To prevent over – ripening, bananas should be

1. given a dip in ascorbic acid
2. maintained at room temperature
3. refrigerated
4. stored at the top of refrigerator

Question-72. Typical plant growth shows _________ curve.

1. J-shaped
2. S-shaped
3. I-shaped
4. Parabolic

Question-73. Which growth hormone accerlates the malting process in brewing industry?

1. Auxins
2. Gibberellins
3. Ethylene
4. Cytokinins

Question-74. Which one is incorrect?

1. Epiblast is presumptive ectoderm and mesoderm
2. Hypoblast is presumptive endoderm
3. Hypoblast is presumptive mesoderm
4. Upper layer of cells in blastoderm is epiblast

Question-75. Which one of the followings is a gaseous plant hormone?

1. Ethylene
2. Gibberellin
3. IAA
4. Abscisic acid

Question-76. Which plant growth regulator is the derivative of carotenoids?

1. Auxin
2. Gibberelic acid
3. Cytokinin
4. Abscisic acid